Preheat the oven to 350°F and line an 8×8 baking pan with parchment paper.
Add the drained and rinsed chickpeas, peanut butter, maple syrup, melted coconut oil, and vanilla extract to a food processor. Blend until completely smooth, scraping down the sides as needed.
Transfer the blended mixture to a large mixing bowl. Stir in the oat flour and salt until fully combined, then fold in the chopped walnuts and white chocolate chips.
Spread the batter evenly into the prepared pan.
Bake for 25–30 minutes, or until the center is set and the edges are lightly golden. Let the blondies cool completely before slicing.